feat: notifications (#1947)

* feat: notifications
* feat: watchers

* improvements

* handle page move for watchers

* make watchers non-blocking

* more

apps/server/src/collaboration/extensions/persistence.extension.ts

@@ -19,11 +19,13 @@ import { Queue } from 'bullmq';
 import {
   extractMentions,
   extractPageMentions,
+  extractUserMentions,
 } from '../../common/helpers/prosemirror/utils';
 import { isDeepStrictEqual } from 'node:util';
 import {
   IPageBacklinkJob,
   IPageHistoryJob,
+  IPageMentionNotificationJob,
 } from '../../integrations/queue/constants/queue.interface';
 import { Page } from '@docmost/db/types/entity.types';
 import { CollabHistoryService } from '../services/collab-history.service';
@@ -44,6 +46,7 @@ export class PersistenceExtension implements Extension {
     @InjectQueue(QueueName.GENERAL_QUEUE) private generalQueue: Queue,
     @InjectQueue(QueueName.AI_QUEUE) private aiQueue: Queue,
     @InjectQueue(QueueName.HISTORY_QUEUE) private historyQueue: Queue,
+    @InjectQueue(QueueName.NOTIFICATION_QUEUE) private notificationQueue: Queue,
     private readonly collabHistory: CollabHistoryService,
   ) {}
 
@@ -170,6 +173,24 @@ export class PersistenceExtension implements Extension {
         mentions: pageMentions,
       } as IPageBacklinkJob);
 
+      const userMentions = extractUserMentions(mentions);
+      const oldMentions = page.content ? extractMentions(page.content) : [];
+      const oldMentionedUserIds = extractUserMentions(oldMentions).map((m) => m.entityId);
+
+      if (userMentions.length > 0) {
+        await this.notificationQueue.add(QueueJob.PAGE_MENTION_NOTIFICATION, {
+          userMentions: userMentions.map((m) => ({
+            userId: m.entityId,
+            mentionId: m.id,
+            creatorId: m.creatorId,
+          })),
+          oldMentionedUserIds,
+          pageId,
+          spaceId: page.spaceId,
+          workspaceId: page.workspaceId,
+        } as IPageMentionNotificationJob);
+      }
+
       await this.aiQueue.add(QueueJob.PAGE_CONTENT_UPDATED, {
         pageIds: [pageId],
         workspaceId: page.workspaceId,